Free universal web cam software

I have installed my webcam,drivers and software,my friend will buying one soon.She is not very technically minded,so hence some universal software which I can help install/setup over the phone.Thank you

PS - when using your webcam in Skype, both users should click on Start Video, you will both then have the option to see each other in a small picture within the main Skype window, or in a separate window which you can re-size if you wish, or in Full Screen view!